Which of the following accounts for the observation that the pH of pure water at 37°C is 6.8? Answer A: At 37 ° C water is naturally acidic.

Answer B: At 37 ° C the autoionization constant for water, Kw, is larger than it is at 25 °

Answer C: At 37 ° C water has a lower density than it does at 25 ° C; therefore, [H+] is greater.

Answer D: At 37 ° C water ionizes to a lesser extent than it does at 25 ° C